Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 111,302	$ 102,378
Accumulated depreciation and amortization	(77,097)	(76,297)
Property and equipment, net	34,205	26,081
Buildings and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	28,456	26,289
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	27,690	25,835
Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	37,281	36,639
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 17,875	$ 13,615